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• Threshold: The threshold above which dynamic reduction begins.
• Check the threshold display if necessary (thr): If the input signal reaches the set
threshold, the blue dash will move around the arrow symbols. If this dash moves
upwards, the threshold is below the average level and compression is active.
Inversely, if the dash moves below the marking, the input signal becomes too
quiet to be able to reach the threshold; compression will be applied.
• Ratio: This ratio (1:n) specifies by which factor the signal should be reduced once
the threshold has been reached. For example, if the threshold is set to -20 dB and
the ratio to 1:4, an input signal of -10 dB will only be amplified by 2.5 dB (10 dB : 4
= 2.5 dB).
• Attack: This is the response time, e.g. how long the arrangement takes to execute
the required level reduction. Short attack times intercept level peaks, and longer
ones let them through unimpeded (compression only starts past this value).
• Release: This is the time allocated to the circuit to reach the normal amplification
factor.
Note on attack & release: In general, short attacks are used for moderate
compression and making the transient response softer; longer times retain the "bite"
of a specific instrument at larger compression rates or make the sound a bit
snappier. With more difficult sources, like a very dynamic vocal track (ballads), for
example, you can use a longer attack so that the arrangement runs more smoothly
and quietly; the release time may be trimmed audibly to match the pauses or the
song speed.
Shorter release time may be used for modern, aggressive "close up" vocals, e.g.
when breathing sounds are an important stylistic device and the voice should sound
very full and compact.
• Knee: Use this parameter to specify the shape of the characteristic around the
threshold. A "hard knee" means that the transition of 1:1 amplification for level
reduction occurs abruptly; a "soft knee" on the other hand starts much lower than
the threshold and moves the characteristic softly into the reduction. A "hard"
setting is useful for effect-filled, acoustic compression, e.g. individual drum
tracks. A softer setting is useful for complex and sensitive sources like guitars,
pianos, or vocals. The more complex the signal, the easier it will be to notice a
difference. For less sensitive sources, this parameter is usually less important.
Note that for "soft knee" settings, the "threshold" value will need to be re-
adjusted, since the compression starts at a much lower level.
Compression Expert Settings
Of course, you can efficiently compress a lot of data with AM-Track without having to
press the "Expert" button or try out additional options. However, we have added a few
"handy" parameters behind the front panel. This applies equally to both compression
modes.